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About excitation spectrum of 6He below the energy threshold of decay into t + t
O. M. Povoroznyk, O. K. Gorpinich, G. V. Mokhnach, O. O. Jachmenjov
Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
Abstract: Due to measurements and analysis as inclusive proton spectra from the 3Н(α, р) 6Не reaction (Eα = 27.2 MeV) and two-dimensional spectra of p-α coincidences from the four-body 3Н(α, рα)nn reaction (Eα = 27.2 MeV and Eα = 67.2 MeV) was observed the second excited state of 6He at energy excitation near 3 MeV.
Keywords: neutron enriched nuclei, inclusive proton spectrum, statistical decay, four-body nuclear reaction, unbound excited level, three-body resonance.
References:1. Ajzenberg-Selove F. Energy levels of light nuclei A = 5 - 10. Nucl. Phys. A 490 (1988) 1. https://doi.org/10.1016/0375-9474(88)90124-8
2. Hansen P. G., Jonson B. The Neutron Halo of Extremely Neutron-Rich Nuclei. Europhys. Lett. 4 (1987) 409. https://doi.org/10.1209/0295-5075/4/4/005
3. Suzuki Y. The ground-state structure and the soft dipole mode of the 6He nucleus. Nucl. Phys. A 528 (1991) 395. https://doi.org/10.1016/0375-9474(91)90095-N
4. Csoto A. Three-body resonances by complex scaling. Phys. Rev. C 49 (1994) 2244. https://doi.org/10.1103/PhysRevC.49.2244
5. Danilin B. V., Thompson I. J., Vaagen J. S., Zhukov M. V. Three-body continuum structure and response functions of halo nuclei (I): 6He. Nucl. Phys. A 632 (1998) 383. https://doi.org/10.1016/S0375-9474(98)00002-5
6. Thompson I. J., Danilin B. V., Efros V. D. et al. Pauli blocking in three-body models of halo nuclei. Phys. Rev. C 61 (2000) 024318. https://doi.org/10.1103/PhysRevC.61.024318
7. Janecke J., Annakkage T., Berg G. P. A. et al. Structure of the neutron-halo nucleus 6He. Phys. Rev. C 54 (1996) 1070. https://doi.org/10.1103/PhysRevC.54.1070
8. Annakkage T., Janecke J., Winfield J. S. et al. Isovector giant resonances in 6He, 12B, 90Y, 120In, and 208Tl observed in the (7Li, 7Be) charge-exchange reaction. Nucl. Phys. A 648 (1999) 3. https://doi.org/10.1016/S0375-9474(99)00015-9
9. Nakayama S., Yamagata T., Akimune H. et al. Soft Dipole Resonance in the Neutron-Skin Nucleus 6He. Phys. Rev. Lett. 85 (2000) 262. https://doi.org/10.1103/PhysRevLett.85.262
10. Sakuta S. B., Ogloblin A. A., Osadchy O. Y. et al. Direct Experimental Evidence for a Soft-Dipole Response in 6He. Europhys. Lett. 22 (1993) 511. https://doi.org/10.1209/0295-5075/22/7/006
11. Nakamura T., Aumann T., Bazin D. et al. Structure of the weakly-bound nucleus 6He studied via the 6Li(t, 3He)6He reaction. Phys. Lett. B 493 (2000) 209. https://doi.org/10.1016/S0370-2693(00)01146-1
12. Немец О. Ф., Павленко Ю. Н., Пугач В. М. Структура инклюзивных спектров ядерных реакций. Изв. РАН. Сер. физ. 53 (1989) 2183.
13. Горпинич О. К., Павленко В. Н., Поворозник О. М., Стружко Б. Г. О вкладе несвязанных состояний ядра 6Li в инклюзивные спектры дейтронов (α, d) реакции на ядрах 3H, 3He. Изв. РАН. Сер. физ. 57 (1993) 121.
14. Owens R. O. Statistical treatment of tagged photon experiments. Nucl. Instrum. and Methods A 288 (1990) 574. https://doi.org/10.1016/0168-9002(90)90154-X
15. Boland M. J., Garbutt M. A., Rassool R. P. et al. Excitations in the halo nucleus 6He following the 7Li(γ, p)6He reaction. Phys. Rev. C 64 (2001) 031601(R). https://doi.org/10.1103/PhysRevC.64.031601
16. Горпинич О. К., Поворозник О. М., Рознюк Ю. С., Стружко Б. Г. Исследование возбужденных свойств ядра 6Не из взаимодействия альфа-частиц с ядрами трития. Свойства возбужденных состояний атомных ядер и механизмы ядерных реакций. Изв. РАН. Сер. физ. 66 (2002) 743.
17. Горпинич О. К., Конфедератенко В. И., Повоpозник О. М., Стружко Б. Г. Упругое рассеяние и реакции при взаимодействии альфа-частиц с тритием. Изв. РАН. Сер. физ. 56 (1992) 192.
18. Горпинич О.К., Повоpозник О.М., Рознюк Ю.С., Стружко Б. Г. Дослідження розпаду першого збудженого рівня 6Не з α + t взаємодії. Зб. наук. праць Iн-ту ядерних досл. 2 (2001) 53. https://jnpae.kinr.kyiv.ua/02.3/Articles_PDF/jnpae-2001-02-3-053.pdf
19. Newton R. G. Scattering Theory of Waves and Particle (New-York, McGraw-Hill, 1956) p. 219.
20. Furiĉ M., Forster H. H. Two-particle coincidence measurement of four body break-up: Kinematics, phase space, and the detection of possible resonances. Nucl. Instrum. and Methods 98 (1972) 301. https://doi.org/10.1016/0029-554X(72)90111-5
21. Tilley D. R., Cheves C. M., Godwin J. L. et al. Energy levels of light nuclei A = 5, 6, 7. Nucl. Phys. A 708 (2002) 3. https://doi.org/10.1016/S0375-9474(02)00597-3
22. Danilin B. V., Rogde T., Ershov S. N. et al. New modes of halo excitation in the 6He nucleus. Phys. Rev. C 55 (1997) R577. https://doi.org/10.1103/PhysRevC.55.R577
23. Aoyama S., Kato K., Ikeda K. Three-Body Binding and Resonant Mechanisms in Neutron-Rich Light Nuclei Far from Stability Line: Pairing Correlation in Borromean Nuclei. Progress of Theoretical Physics. Supplement 142 (2001) 35. https://doi.org/10.1143/PTPS.142.35